NO. 3665 CADDISFLIES—FLINT 15 
Apuut.—Length of forewing 4.5-5 mm. Color fuscus; coxae and 
femora yellowish brown. Vein M of hindwings 3 branched. Male 
genitalia: ninth sternum with an elongate, terete, apicomesal process; 
tenth tergum with a dorsomesal flaplike lobe, lateral lobe with a 
darkened slightly protruding area at midlength bearing sensillae, 
ventrally with a pair of straplike sclerites articulating beneath aedea- 
gus; clasper elongate, enlarged basoventrally, apex enlarged, curved 
mesally, with a thumblike, subapical projection; aedeagus with a spine- 
like apicoventral lip, a scabrous sac with darkened pouch, two spines, and 
ring and rod. Female genitalia: eighth segment divided dorsomesally, 
with anterolateral processes, posterior margin with a few enlarged 
setae; ninth tergum with very long anterolateral processes; bursa 
copulatrix with a basal ring, elongate ventral plates, and a dorsal 
hoodlike structure. 
LaRvA AND PupA.—Unknown. 
Materrau.—Holotype, male: Grenada, 2 miles west of Lake Grand Etang, 
4-8 Aug. 1963, O. S. Flint, Jr., USNM Type 69882. Allotype, female: same data. 
Paratypes: same data, 14o° 39. Other: Trinidad, Simla, Arima Valley, 9-12 
Feb. 1966, S. S. and W. D. Duckworth, 607; same, but 13-19 Feb. 1966, 1107; 
same, but 20-26 Feb. 1966, 6c. 
Brotogy.—The adults were collected on Grenada beside a small 
(3 feet wide by 3-6 inches deep) tumbling, mountain brook. It is 
assumed that the larvae were living in the same stream although none 
were found. 
Family PsycHOMYIIDAE 
The psychomyiids are found throughout the world. Although most 
species breed in flowing water, there are a number that breed in lentic 
situations. The genera Xiphocentron, Cernotina, and Polycentropus are 
found throughout the Antilles although the species of the latter genus 
on the Greater Antilles are not closely related to the Lesser Antillean 
species. The West Indian endemic genus Antillopsyche is limited to 
the Greater Antilles, but the widespread genus Polyplectropus has not 
been found on these islands. 
The immature stages of most genera make flimsy silken nets to 
trap their prey although certain others make long silken tubes affixed 
to the substrate. The pupae are generally sheltered in a domelike case 
of silk and sand. 
Key to Genera 
LARVAE 
1. Tibia and tarsus fused; a broad flat process extending anteriorly from the 
MHESOPICULO Msi... Nay Meena, ZeNeW Suaeos ate eid. Ae .... . . . Xiphocentron 
Tibia and tarsus not fused; no process from mesopleuron. . ..... . 2 
2. Mandibles with dorsal row of teeth overhanging ventralrow. .. . «2a iS 
Mandibles with dorsal row not overhanging ventralrow . . . Polycentropus 
